Getting your site to display at the top of a SERP is quite an accomplishment, but it also takes quite a bit of effort to keep it there. If people click through to your site only to click their back buttons and look for another result, the search engines are going to catch on, and you could fall in the rankings.
In this Whiteboard Friday video, Rand helps us broaden our thinking to satisfy the searchers and keep them from pogo-sticking back to the SERP.